Coffee mug



FIG. 1 is a perspective view showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left view thereof.

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a right view thereof. 

The ornamental design for a coffee mug, as shown. 